Eighty percent of baby products contain toxic or untested chemical flame retardants, according to a new study of products such as car seats, changing pads and portable cribs.

One-third of products, which also included nursing pillows, contained a chemical called chlorinated tris, which was removed from children's pajamas in the 1970s because of cancer concerns, though the chemical was never banned, says a study released Wednesday in Environmental Science & Technology.

The Environmental Protection Agency has said there is a "moderate level of concern" about links between tris and cancer, developmental problems, reproductive problems and other health concerns. The Consumer Product Safety Commission also has found that tris "may pose a significant health risk," spokesman Scott Wolfson says.